Microsoft has released an out-of-band patch for two severe flaws in Windows Defender discovered by the National Cyber Security Centre (NCSC), a unit of UK spy agency GCHQ that dispenses cyber defense advice to the government and public. Just last week, for example, NCSC told UK agencies hosting information classified ‘secret’ never to use any Russian antivirus, including Kaspersky, due to the risk of Russian cyber spies using it as a backdoor.

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